System Architect – Design IT jobs in Sherbrooke, Quebec
Find System Architect – Design IT job opportunities in Sherbrooke, Quebec.
System Architect – Design IT jobs in Sherbrooke, Quebec(1)
Senior Blockchain Developer (Ethereum)
Ethereum
Sherbrooke• Remote
Senior Blockchain Developer (Ethereum)
Ethereum
Salary
$135,000 to $175,000 per year
Job Type
Permanent, Full time
Experience
5 to 10 years
Category
Information Technology
Specialization
System Architect – Design, Data Center – Mining – Warehousing, Programing – Development
About Us
We build concrete Web3 products (DeFi / tokenization / infrastructure) with one obsession: security, performance, and ease of use. Our stack is centered on Ethereum & its ecosystem (L2, tooling, audits, monitoring).
📍 Location: Remote / Hybrid / On-site (to be specified)
🕒 Type: Permanent / Contract / Freelance (to be specified)
Your mission
As a Senior Blockchain Developer (Ethereum), you will design, develop, and secure smart contracts and associated backend services, and you will help the team increase its technical maturity.
Specifically, you will :
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Design and develop Smart Solidity contracts (ERC-20/721/1155, proxies, advanced patterns).
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Implement a security-first strategy: code reviews, fuzzing, invariants, simulations, audit readiness.
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Build the development tooling: Hard Hat / Foundry, CI, coverage, unit and integration testing, deployment scripts.
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Design the on-chain/off-chain interaction architecture (indexing, events, subgraphs, oracles if needed).
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Optimize gas, performance and reliability (monitoring, alerting, key management, permissions).
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Participate in product/tech choices (L2, account abstraction, standards, upgradeability).
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Mentor developers and contribute to best practices (ADR, documentation, patterns, reviews).
Desired Profile
Essential
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5+ years of development experience, including 2+ years on Ethereum / EVM in production.
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Excellent command of Solidity and the main patterns (access control, upgradeability, pausable, roles).
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Very good level in testing and quality: Foundry/Hard Hat, property-based tests, testnets, mainnet deployments.
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Good security culture: reentrancy, MEV, frontrunning, overflow/underflow, signature malleability, etc.
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Comfortable with Git, CI/CD, Code review and product teamwork.
Bonus Perks
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Experience in DeFi (AMM, lending, staking, vaults, liquidation).
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Knowledge of L2 (Optimism/Arbitrum/Base/zkSync) and bridges/messaging.
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Audit experience (internal or external), Echidna, Slither, Mythril, Tenderly.
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Node / Rust / Go / Python on the tooling or services side.
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Experience with The Graph, indexers, on-chain data pipelines.
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Stack & tools
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Smart contracts: Solidity, Foundry/Hardhat, OpenZeppelin
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Infra: RPC providers, multisig (Safe), monitoring (Tenderly/Defender-like), CI/CD
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Off-chain: Node/TS (often), indexing, subgraphs (depending on the product)
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What we offer
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Compensation: XX–YY € (depending on profile) + bonus / tokens (if applicable)
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Full remote work possible + equipment budget
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Time dedicated to security (testing, audits, bug bounties)
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Autonomy, product impact, real technical decisions
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A team that values clean PRs and useful documentation
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Recruitment process (example)
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30-minute call (fit + context)
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Technical interview (Solidity/EVM + architecture)
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Short exercise (audit/review or mini-feature)
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Team meeting + offer
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About Ethereum
Website
ethereum.orgPosted
1 month ago
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